rub-a-dub

from WordNet (r) 3.0 (2006)

rub-a-dub
    n 1: the sound made by beating a drum [syn: {rub-a-dub},
         {rataplan}, {drumbeat}]

from The Collaborative International Dictionary of English v.0.48

Ruba-dub \Rub"a-dub\, n.
   The sound of a drum when continuously beaten; hence, a
   clamorous, repeated sound; a clatter.
   [1913 Webster]

         The rubadub of the abolition presses.    --D. Webster.
   [1913 Webster]